diff --git a/content/members/haesojin-shin/index.md b/content/members/haesojin-shin/index.md
index b31f2a1..a88d3b6 100644
--- a/content/members/haesojin-shin/index.md
+++ b/content/members/haesojin-shin/index.md
@@ -3,7 +3,7 @@ draft = false
 title = 'Haesojin Shin'
 ko = '신해소진'
 role = 'Ph.D. Student'
-portrait = 'portrait.jpg'
+portrait = 'portrait.png'
 
 [[affiliation]]
 name = 'Software Analysis Laboratory'
diff --git a/content/members/haesojin-shin/portrait.png b/content/members/haesojin-shin/portrait.png
new file mode 100644
index 0000000..3a4cb2b
Binary files /dev/null and b/content/members/haesojin-shin/portrait.png differ
diff --git a/content/members/seokho-lee/portrait.jpg b/content/members/seokho-lee/portrait.jpg
index 597fb9e..fcfcf41 100644
Binary files a/content/members/seokho-lee/portrait.jpg and b/content/members/seokho-lee/portrait.jpg differ